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Heir Audio 3.A S 3-Driver Custom In-Ear Monitor

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Heir Audio 3.A S 3-Driver Custom In-Ear Monitor

  • 3 Precision Tuned Balanced Armature Drivers

  • Three Way Passive Cross Over Design

  • One Balanced Armature Driver for Low Frequency Production

  • One Balanced Armature Driver for  Medium Frequency Production

  • One Balanced Armature Driver for High Frequency Production

  • Dual Bore design

  • AVX OxiCap Capacitors

  • Vishay Resistors

  • Hypoallergenic, Hard Acrylic Shells

  • Detachable cable

Universal demo unit available for auditioning at our Tai Seng office!

*Heir Audio strongly advises customers to take Ear Impressions with a qualified Audiologist.



We are proud to introduce the 3.A S, as it presents an acoustic response with a little extra bump in the bass and good crisp highs. It was built for the audio enthusiasts that like fair amount of low frequency representation, coupled with good clean sound. The 3.A S carries three precision balance armature drivers, one large one for bass production and two small ones for middle and high frequency production. The 3.A S is a great product that will put a little “spring” in your step and a smile on your face.

Standard CIEM features

  • All faceplates will match the shell colour (additional fees apply for different shell and faceplate colours)
  • All faceplates carry the company Logo (Optional)
  • All standard cables are black
  • Non-recessed sockets
  • All colours are transparent

NOTE: Logo colour selection and placement location is at the discretion of Heir Audio. The free Heir Audio logo option is not recommended for wood and carbon fibre faceplates, as we believe it detracts from the beauty of the CIEMs.

Click to read more Useful Information and check out the available Colour & Artwork options!

Technical Specifications

Additional Information

Colour Customisable
Warranty 1 year (local)
Product Weight (g) 299
Country of Manufacture China
Availability Discontinued
Product Type Earphone
Style/Type Custom In-Ear (CIEM)
Driver Configuration 3-Drivers (Balanced Armature)
Headphone Design Closed-Back
Cable Style Detachable (2-pin Westone/CIEM)
Input Connectivity 3.5mm stereo
User Reviews

Customer Reviews 1 item(s)

Worth every cent
Bought these to use in church for on stage monitoring.
Extremely clear and the bass is phonomenal.
Separation amongst instruments is the best I've heard and although the bass is strong, it does not muddy up the sound.
Build Quality
Value For Money
Review by Dominic / (Posted on 15/04/2015)